<template>
	<view>
		<!-- 使用自定义的搜索组件 -->
			<view class="search-box">
					<my-search @click="gotoSearch"></my-search>
			</view>
		
			
		<view class="scroll-view-container">
			<!-- 左侧的滑动区域 -->
			<scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh +'p x'}">
				<block v-for="(item,i) in cateList" :key="i">
						<view :class="['left-scroll-view-item',i === active ? 'active': '']" @click="activeChanged(i)">{{item.cat_name}}</view>
				</block>
			</scroll-view>
			
			<!-- 右侧的滑动区域 -->
			<scroll-view scroll-y  :style="{height: wh +'px'}" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
					<!-- 二级分类的标签 -->
					<view class="cate-lv2-title">/{{item2.cat_name}}/</view>
					<!-- 当前二级分类的三级分类列表 -->
					<view class="cate-lv3-list">
							<view @click="gotoGoodsList(item3)" class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3">
								<!-- 三级分类的图片 -->
								<image :src="item3.cat_icon"></image>
								<text>{{item3.cat_name}}</text>
							</view>
					</view>
					
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>	
import badgeMix from '@/mixins/tabbar-badge.js'
	export default {
		mixins:[badgeMix],
		data() {
			return {
				//当前设备可用的高度
				wh: 0,
				
				//获取分类页的数据
				cateList:[],
				active:0,
				//二级分类列表
				cateLevel2:[],
				//滚动条距离顶部的距离
				scrollTop:0
			};
		},
		onLoad() {
			const sysInfo = uni.getSystemInfoSync()
			this.wh = sysInfo.windowHeight - 50
			
			this.getCateList()
		},
		methods:{
			//获取分类列表的数据
		async	getCateList(){
				const {data: res} = await uni.$http.get('/api/public/v1/categories')
				if(res.meta.status !==200) return uni.$showMsg()
				this.cateList = res.message
				
				//为二级分类赋值
				this.cateLevel2 = res.message[0].children
			},
			activeChanged(i){
				this.active = i
				// 为二级分类列表重新赋值
				this.cateLevel2 = this.cateList[i].children
				
				this.scrollTop =  this.scrollTop === 0 ? 1 : 0
			},
			gotoGoodsList(item){
				 uni.navigateTo({
				 	url:'/subpkg/goods_list/goods_list?cid=' +item.cat_id
				 })
			},
			gotoSearch(){
				uni.navigateTo({
					url:'/subpkg/search/search'
				})
			}
		}
	}
</script>

<style lang="scss">
	.scroll-view-container {
		display: flex;

		.left-scroll-view {
			width: 120px;
		
			.left-scroll-view-item{
				background-color: #F7F7F7;
				line-height: 60px;
				text-align: center;
				font-size: 12px;
				
				&.active{
					background-color: #FFFFFF;
					position: relative;
					
					&::before{
						content: '';
						display: block;
						width: 3px;
						height: 30px;
						background-color: #C00000;
						position: absolute;
						top: 50%;
						left: 0;
						transform: translateY(-50%);
					}
				}
			}
			
		}
	}
	
	.cate-lv2-title{
			font-size: 12-px;
			font-weight: bold;
			text-align: center;
			padding: 15px 0;
	}
	
	.cate-lv3-list{
		display: flex;
		flex-wrap: wrap;
		
		.cate-lv3-item{
			width: 33.33%;
			display: flex;
			flex-direction: column;
			justify-content: center;
			align-items: center;
			
			image{
				width: 60px;
				height: 60px;
			}
			
			text{
				font-size: 12px;
			}
		}
	}

	.search-box{
		position: sticky;
		top: 0;
		z-index: 999;
	}
</style>
